Dust-collector for drills.



W. PRELLWITZ.

' DUST COLLECTOR FOR DRILLS.

APPLIOATION FILED OUT. 25, 1907.

1,023,594. Patented Apr. 16, 1912.

3 SHEETS-SHEET l.

W. FRBLLWITZ.

DUST CDLLEQTOR FOR DRILLS. APPLICIATIOH FILED 00126, 1907 1,023,594.Patented Apr. 16, 1912.

a BEEETBSHEET 2.

W. PRELLWITZ.

DUST COLLECTOR FORDRILLS.

APPLICATION FILED now. 26, 1901.

1,023,594. Patented Apr. 16, 1912.

a SHEETS-SHEET UNITED STATES PATENT OFFICE.

wnmm: rnnnnmrz', or msron', PENNSYLVANIA, -assrcrnon 'ro mennsoLL-nsnncomm, or NEW YORK, N. Y., A coarona'rron' oF'Nnw masnr.

fDUST-COLLECTOB FOR DRILLS.

Specification of Letters latent.

Patented A r. 16, 1912'.

A p'neauo mea mm as, 1907. Serial No. 399,249.

and State of Pennsylvania, have invented a new and useful Improvement inDust-Gollectors for Drills, of which the following is a specification.

Inoonnection with rock drills, more particularl those known as hammerdrills and preferably those which use a hollow drill steel, where airblows through the steel fbr ejecting the cuttings gagreat deal of dustis caused by the latter blowing out of the 16 drill hole. The dustand'chips blown from the hole make it unhealthy and annoying to theoperator of the drill as the operator must necessarily inhale the dustto a greater 7 or lesserextent. R The object of this present inventionis to obviate these objections by providing a dust collector which maybe secured to the hole being bored, said dust collector having anejector operated either by live air or the-exzfi-haust from the drillfor forcing the dust l and chips into a receptacle provided thereformtoany predetermined oint.

A-practical embodiment 0 my invention represented in the'accompanyingdraw- 80 in? m which I igure 1 is a view showing the dust collector inposition for use in connection with air power feed hammer drill suported from a vertical column, one form-o device 36 forsecuring thecollector to the hole being represented. Fig. 2 is an enlarged sectionow through the hollow casing, the ejector and the'frlction holdingdevice of the dust col- ,lector. Fig. 3 is anl'outside view of the-sart1e, Fig. 4is a cross section taken in the plane of the'line A-A ofFig.- 2, looking in the "direction of the arrows. Fi 5 is an enlargedsection through the modified form n is of easing, ejector and frictionholding device, an Fig. 6 is an outside view 0 the same.

The drill in connection with which I hav shown and will describe mdustcollector is of the air feed hammer rill type and it is represented asbeing supporte from a column bar 1. The head block of the drill isdenoted by 2, its cylinder by 3, the rear extension by 4 and the hollowdrill steel by 5. The motive fluid for the .drill may be admittedthrough a pipe 6, which fluid in the present instance also serves tofeed the drill to'its work. A handle 7 is provided for oscillating thednill while in operation. In this form of drill a certain amount of theair is passed through the drill steel for dislodging the dust and chipsfrom the hole hein bored and the balance of the motive fluid isexhausted through the flexible tube 8. The hollow casing of the dustcollector is denoted by 9 and it is provided with openings 10 and 11through which the drill steel b may be passed and fed to its work. Theinner nozzle of an ejector forming part of the casin 9, is denoted by.12 and the outer nozzle 0 l the ejector denoted by 13 is provided witha screw-threaded.jcrrgagement with an extension 14 of the casing, inwhic extension'is located a chamber 15 in open communication with theflexible pipe 8,

a which pipe is of sufficient length to permit the insertionandwithdrawal of the longest drill steel which it is intended to use inconnection with the drill. It is to be under stood that the outer nozzle13 of the ejector may be adjusted so as to control the. opening betweenthe inner and 'outer nozzles to suit different requirements; as forinstance, if it be desired to feed live air directly to the ejectorinstead of the exhaust from the drill. A look nut 16is provided forlocking the outer nozzle 13 of the ejector in its adjustment. Areceptacle is provided'for the dust and chips, which receptacle isherein shown as a porous bag 17 which is preferably woven suflicientlyclose to maintaln a few pounds of air ressure therein but which will letthe air lea through the meshes thereof gradually and at the same timekeep the dust and chips therein. A flexible tube 18 leads from theejector nozzle ,13 into the bag 17 for'permitting the ejec tor to forcethe dust and chips into the said receptacle.

The device which I have shown in Fi j r 1 to 4: inclusive forfrictionally securing t e casing 9 of the dust-collector to the hole be-"shape 1d steel may be inserted into and removed from the hole withoutthe necessity of removing the casing of the dust collector from itsposition In this form the casing may be secured to the hole being bored,without enlarging the mouth of the hole.

In the form shown in Figs. 5 and 6, the sleeve 21 is secured in theopening 11 of the casing 9, and the portion of the sleeve which projectsfrom the casing is divided into a plurality of fingers 22 which arearranged to frictionally engage the walls of an enlarged portion of thehole bein bored. hen this latter f"rm of friction device is ejecting thecuttings from the hole being bored, of a dustcollector comprising ahollow casinglocated at the mouth of the hole being bored and an ejectorcontrolled by the motive fluid exh'aust from the drill for forcing thecuttings from the hollow casing to a predetermined point. I l

3. he combination with a drill, of a dust collector comprising a hollow!casing located at the mouth of the hole ,being'bored, a receptaclc, atube leading from the hollow usgd, the hole is started by a larger bitfor casing to the'receptacle and an ejector loa sufficient distance topermit the insertion of thefinger's 22 and then a smaller bit is usedfor continuing the boring of the hole. This form also will permit thefree insertion and removal of the drill steel without necessitating theremoval of the casing of the collector.

In operation the hole is first drilled to a depth of several inches. Ifthe casing of the collector has been slipped over the drill steelrevious to the starting of the drill, the friction holding fingers ofits attaching device can then be inserted into the holes for securingthe casing in position. Otherwise the drill steel ma be withdrawnandthecasing then secure in position and the drill steel again insertedinto position for work. As the drilling is continued and the dust andchips fiy out of the hole being bored, the ejector sucks the dust andchips from the hole and forces the same into the receptacle providedtherefor.-

'While "I have shown this dust collector as being applied to an air feedhammer drill, it is to be understood that it may be used in connectionwith drills of any other kind. It is also to be understood that eitherlive air or exhaust air may be used for o crating the ejector. Thereceptacle for tie dust and chips may be eliminated and the flexibletube 18 be extended to any desired point where it is desired .to depositthe dust and chips.

It is evident that various changes ma be resorted to in theconstruction, form an arrangement of the several parts without de--parting from the spirit and scope of my invention hence I do not wish tolimit myself strictly to the structure herein set forth, but

cated between the hollowcasing and receptacle and controlled by themotive fluid of the drill for forcing the cuttings from the hollowcasing through the tube into said receptacle.

4. The combination with a drill, of a dust collector, comprising ahollow casing located at the mouth of the hole being-bored, areceptacle, a tube leading from' th 'hollow casing to the receptacle andan eject'or located between the hollow casing and receptacle andcontrolled by the motwe fluid exhaust from the drill for forcing thecuttin s from the hollow casing through the tu into said receptacle.

5. The combination with a drill, of a dust collector comprising a hollowcasing, a device for securing the casing to the hole being bored, areceptacle, a tube leading from the hollow casin to the receptacle andan ejector controlle by the motive fluid of .the drill for forcing thecuttings from the hollow casing through the tube into said receptacle.

6. The combination with a drill, of a dust collector comprisinga hollowcasing, a device for securing the casing to the holebeing bored, areceptacle, a tube leading from the hollow casing to the receptacle andan ejector controlled by the motive fluid exhaust from the drill forforcing the cuttings from the hollow casing through the tube into saidreceptacle.

7 The combination with a drill, of a dust collector including a hollowcasing located at the mouth of the hole being bored and an ejectorcontrolled by the motive fluid of the drill for forcing the cuttingsfrom said casing to a predetermined-point.

, 8. The combination with a drill, of a dust collector including ahollow casing located at the mouth of the hole being bored and anpresence of two witnesses, this 21st day of 1(raljectorf COIlfilfifllgd613E thfe motivel fluid ex- October 1907.

aust romt e ri or orcin t ecuttin s r from the hollow casing to a predetermine d W1 LLIAM PRELLWITA- 5 point. r A Witnesses:

In testimony, that I claim the foregoing F. GEORGE BARRY, as myinvention, I have signed my name in HENRY THlEMEQ

